Rust errors / Names, paths and imports
Rust compiler error · checked with rustc 1.99.0
Rust error E0130: patterns aren't allowed in foreign function declarations
What it meansA pattern was declared as an argument in a foreign function declaration.
What rustc prints
error[E0130]: patterns aren't allowed in foreign function declarations
--> main.rs:2:12
|
2 | fn foo((a, b): (u32, u32)); // error: patterns aren't allowed in foreign
| ^^^^^^ pattern not allowed in foreign functionReal output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.
E0130Names, paths and imports
Activein rustc 1.99.0
8related errors linked below
The compiler team's explanation
A pattern was declared as an argument in a foreign function declaration.
Erroneous code example:
extern "C" {
fn foo((a, b): (u32, u32)); // error: patterns aren't allowed in foreign
// function declarations
}To fix this error, replace the pattern argument with a regular one. Example:
struct SomeStruct {
a: u32,
b: u32,
}
extern "C" {
fn foo(s: SomeStruct); // ok!
}Or:
extern "C" {
fn foo(a: (u32, u32)); // ok!
}From rustc --explain E0130 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
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